1996 Corvette changed coil and controller. now won't start
05-16-2018, 09:23 PM
#21
Le Mans Master
Thanks to an idea here, I was able to put a spark tester on where I could see it while cranking over the engine. No spark! what could I have done by changing the coil and ICM? The original ICM and coil are back on the car so it isn't a matter of defective new parts.
Here is a useful diagnostic procedure for some of this stuff: http://easyautodiagnostics.com/gm/4....test-the-icm-1.
Last edited by MatthewMiller; 05-16-2018 at 09:31 PM.
05-16-2018, 10:25 PM
#22
Melting Slicks
Just another approach to checking spark that I've used. It works for the coil wire as well.
I use an inductive timing light like a noid light. Just clamp to any wire and hold it while starting the car. It will flash if there is spark.
Coil wire will flash so fast it will look solid but it still tells you the light is seeing spark.
I use an inductive timing light like a noid light. Just clamp to any wire and hold it while starting the car. It will flash if there is spark.
Coil wire will flash so fast it will look solid but it still tells you the light is seeing spark.
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Southern Boy (05-17-2018)
05-16-2018, 10:52 PM
#23
You need to follow shbox lt1 no start guide.
From memory, to get spark the icm needs a signal from the ecm to send the trigger to the coil. Then the coil woll fore, and send spark thru the opti. So I would check if you'e getting signal to the icm, and then from the icm to the coil.
It's an old car, you may have broken a wore during the install.
From memory, to get spark the icm needs a signal from the ecm to send the trigger to the coil. Then the coil woll fore, and send spark thru the opti. So I would check if you'e getting signal to the icm, and then from the icm to the coil.
It's an old car, you may have broken a wore during the install.
05-16-2018, 11:59 PM
#24
Le Mans Master
I'm very glad you solved the biggest issue! It's an easy problem to have on a car as old as ours.
The following users liked this post:
Southern Boy (05-17-2018)
05-17-2018, 11:05 PM
#26
05-17-2018, 11:09 PM
#27
Just another approach to checking spark that I've used. It works for the coil wire as well.
I use an inductive timing light like a noid light. Just clamp to any wire and hold it while starting the car. It will flash if there is spark.
Coil wire will flash so fast it will look solid but it still tells you the light is seeing spark.
I use an inductive timing light like a noid light. Just clamp to any wire and hold it while starting the car. It will flash if there is spark.
Coil wire will flash so fast it will look solid but it still tells you the light is seeing spark.
